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A sequential phase energization technique for transformer inrush current reduction - Part I: Simulation and experimental results

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4 Author(s)
Yu Cui ; Dept. of Electr. & Comput. Eng., Univ. of Alberta, Edmonton, Alta., Canada ; Abdulsalam, S.G. ; Shiuming Chen ; Wilsun Xu

This paper presents a new, simple and low cost method to reduce inrush currents caused by transformer energization. The method uses a grounding resistor connected at a transformer neutral point. By energizing each phase of the transformer in sequence, the neutral resistor behaves as a series-inserted resistor and thereby significantly reduces the energization inrush currents. The proposed method has been tested by computer simulation and laboratory experiments. Both results show that the method has a performance similar to that of the resistor pre-insertion scheme. The proposed method is much less expensive, however, since there is only one resistor involved and the resistor carries only a small neutral current in steady-state.

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Power Delivery, IEEE Transactions on  (Volume:20 ,  Issue: 2 )